@media screen and (min-width: 375px) {
    html {
        font-size: 20px;
    }
}

@media screen and (max-height: 480px) {
    html {
        font-size: 20px;
    }
}

@media screen and (min-width: 525px) {
    html {
        font-size: 28px;
    }
}

@media screen and (min-width: 450px) {
    html {
        font-size: 24px;
    }
}

@function rem($a) {
    @return ($a/50)+rem; //以750标准设计稿为准
}

$theme-color:#e74e4b;